Dolby Digital

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Dolby Digital

A family of digital audio encoding technologies from Dolby used in movie theaters, home theaters and video games. Introduced in the movie "Batman Returns" in 1992, Dolby Digital has been the most widely used surround sound system in the world. Following are the major formats. See Dolby Surround and surround sound.

Dolby Digital - 5.1 Channels
Five discrete channels of audio plus subwoofer (see surround sound). Dolby Digital employs Dolby's AC-3 coding and compression technology (see AC-3).

Dolby Digital EX - 6.1 and 7.1 Channels
Co-developed with Lucasfilm THX, Dolby Digital EX adds one or two matrixed rear center channels. Formerly "Dolby Digital Surround EX," the first film to use this enhanced version of Dolby Digital was "Star Wars: Episode I - The Phantom Menace," in 1999.

Dolby Digital Plus - 6.1 and 7.1 Channels
Part of the Blu-ray specification, Dolby Digital Plus supports higher bit rates than EX. Also called "DD+" and "Enhanced AC-3" (E-AC-3).

Dolby TrueHD - 7.1 on Blu-ray
Providing up to 14 discrete sound channels in the complete specification, TrueHD used in Blu-ray movies delivers stereo at 192 kHz and up to eight channels (7.1) at 96 kHz. Introduced in 2006, Dolby TrueHD competes with DTS-HD for high-definition Blu-ray audio formats. HDMI 1.3 cables are required. See Blu-ray, DTS and HDMI.

Dolby Atmos - 9.1 Channels
Introduced in 2012, Atmos supports 128 audio tracks and up to 64 speakers in the cinema, although home theaters require at least a 5.1 system plus two "height speakers" that can either be ceiling mounted or "upward firing." Transformers: Age of Extinction was the first Atmos Blu-ray movie. Touted as "object-based surround sound," rather than "front and back surround," DTS:X was introduced with a similar approach (see DTS).
References in periodicals archive ?
Dolby Digital Live converts any audio signal from a PC or game console into Dolby Digital for easy connection to home theater systems through a single digital cable
Dolby Digital Live is a real-time encoding technology which converts audio signals into a Dolby Digital bitstream for transport and playback through a home theater system via a single digital connection.
Designed for Dolby Home Theater motherboards feature support for Dolby Digital Live, Dolby Pro Logic II, Dolby Headphone and Dolby Virtual Speaker technologies.
Using Intel-based PCs with HD-Audio featuring Dolby licensed software applications and integrated audio codec solutions, Dolby will be demonstrating the following technologies: Dolby Digital Live, Dolby Digital 5.
The STAC9220 is targeted at the Dolby(R) Home Theater(TM) specification which shows that the PC will provides system-wide access to Dolby Digital Live, Dolby(R) Headphone(TM), Dolby(R) Virtual Speaker(TM), and Dolby(R) Pro Logic(R) II technology with 5.
Each of these motherboards features Dolby Digital EX, Dolby Digital Live, Dolby Pro Logic(R) IIx, Dolby Headphone, and Dolby Virtual Speaker technologies.
Designed for Dolby Home Theater and Designed for Dolby Master Studio mainboard offerings from Abit, Asus, Gigabyte, Intel, and MSI feature Dolby technologies including Dolby Digital EX, Dolby Digital Live, Dolby Pro Logic(R) IIx, Dolby Headphone, and Dolby Virtual Speaker.
Designed to provide additional PC system audio value, Dolby-approved SigmaTel Theater Quality HD Audio codecs enable system-wide access to Dolby premier technologies including Dolby Digital EX, Dolby Pro Logic(R) IIx, Dolby Headphone, Dolby Virtual Speaker, and Dolby Digital Live.
Dolby PC Entertainment Experience, which includes Dolby Digital Live, Dolby Pro Logic(R) IIx, Dolby Virtual Speaker technology, and Dolby Headphone technology
Both systems feature the Dolby Master Studio suite of technologies, including Dolby Digital EX, Dolby Digital Live, Dolby Pro Logic(R) IIx, Dolby Headphone, and Dolby Virtual Speaker, with support for up to 7.
In addition, the system features the Dolby Home Theater suite of technologies including Dolby Digital, Dolby Digital Live, Dolby Pro Logic(R) II, Dolby Headphone, and Dolby Virtual Speaker.
Dolby Digital Live, which makes it easy to connect a PC to an A/V receiver using a single digital cable, eliminating the confusion, hassle, and clutter of multiple connections